Vehicle Door Handle Assembly Side Impact Locking Mechanism
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Solution Overview
Problem
Conventional mechanisms for preventing vehicle door opening during side impacts fail to maintain the door closed due to inertia-induced displacement of balance loads, leading to safety hazards and design inefficiencies.
Innovation Solution
A door handle assembly with a housing and actuator mechanism featuring a spring-loaded first lever and a second lever, both pivotably positioned, which maintain contact with a grip lever to exert holding forces during and after a side impact, preventing the release of the outside handle rod and ensuring the door remains closed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a balance load is added to the outside handle lever to generate holding force during side impact, then the door remains closed during impact, but the balance load pushes the outside handle lever after impact due to inertia, causing the door to open
Solution Approach 1:
The patent divides the single lever system into two separate levers: a first lever that carries the balance load and a second lever that carries the outside handle rod. This segmentation allows the balance load to be isolated on the first lever, preventing it from interfering with the outside handle rod on the second lever after impact, while both levers work together during impact to maintain door closure.
Solution Approach 2:
The grip lever acts as an intermediary between the two levers and the handle grip. It transmits the holding force from both levers to the handle grip during impact, and allows the outside handle rod to remain engaged with the latch mechanism by preventing direct transmission of inertia forces from the balance load.
2Device complexity
If the outside handle lever is used to carry both the balance load and the outside handle rod, then the structure is simple, but the inertia force causes the lever to displace and release the door
Solution Approach 1:
The patent segments the lever system into two distinct levers with separate functions. The first lever is dedicated to carrying the balance load, while the second lever carries the outside handle rod. This eliminates the interference between the balance load and outside handle rod that occurs in the single-lever design, preventing inertia-induced displacement after impact.
Solution Approach 2:
Each lever is designed with specific local properties optimized for its function. The first lever is configured with appropriate length, pivot position, and spring loading to effectively carry the balance load. The second lever is configured to properly position and hold the outside handle rod. This localized optimization ensures each component performs its function reliably without interfering with the other.
3Ease of manufacture
If a single lever system is used, then the design is economical and simple, but it fails to prevent door opening after side impact
Solution Approach 1:
The patent uses a segmented two-lever design that provides the necessary safety function while remaining relatively simple to manufacture. Each lever can be produced using standard manufacturing processes, and the segmentation allows for modular assembly and maintenance, balancing safety requirements with manufacturing feasibility.
Solution Approach 2:
The lever system incorporates dynamic elements including spring loading on the first lever and pivotable connections that allow the levers to respond to impact forces. The springs provide continuous holding force, and the pivotable joints allow the levers to adapt to force directions during and after impact, enhancing safety without requiring complex active control systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The mechanism effectively prevents door opening during side impacts by maintaining the holding force on the grip lever, enhancing safety while minimizing design changes and costs, thus addressing the shortcomings of existing solutions.
Implementation Method 1
The first lever is spring loaded
Implementation Method 2
a pivot shaft, the first lever and the second lever are pivoted within the housing by a pivot shaft
Implementation Method 3
both pivotably positioned, which maintain contact with a grip lever to exert holding forces during and after a side impact
Data Source
AI summary
A door handle assembly configured for installation in a motor vehicle door may include a housing accommodating an actuator mechanism, a grip assembly activating the actuator mechanism, wherein the actuator mechanism includes a plurality of levers juxtaposed to each other and pivotably positioned in the housing, and the plurality of levers having a first lever and a second lever, wherein the first lever and the second lever may be positioned to be in contact with a grip lever during a normal working condition and during a side impact condition of the vehicle, thereby exerting a holding force on the grip lever, and wherein after experiencing the side impact, the first lever may be configured to rotate about a pivot and the second lever continues exerting the holding force on the grip lever.